Cover for pneumatic tires.



L. LIAIS.

COVER FOB. PNEUMATIC TIRES.

APPLIOATION FILED saw. 21, 1910.

1,023,666. Patented Apr. 16, 1912.

[Ill/l7 WW r28 77Mmf. '2

siding 'at LUOEEN LIAIB, OF PARIS, FRANCE.

CGVEE FOB. PNEUHATIQ TIRES.

Specification of Letters Patent.

Patented Apr. 16, 1912.

Application flied September 21, 1910. Serial No. 588.052.

To all whom it may camera:

Be it known that I, lit-(12x Lula, engineer, a citizen of the French Republic, re 129"" line tie in Pompe, Paris, Frunce, have invented certain new and useful Improvements in (lovers for Pneumatic Tires, of which the following is u specification.

Heretofdre pneumatic tires of that ty which oreproyidetl with an internal butin; or lining of canvas or equivulent material have been liable to burst for the reason that their construction prerehts them from efiiciently resisting stresses tending to cause them to burst.

The object of 'the; present iuventiou is to.

overcome this disadvantage.

The invention-is based on my observation that the disadvantage in question isuluo to the fuel; that the lining or booking in tires of ordinaryconstruction is always, during use, in estate of extremetension closely approaching thehreuking-stres's, the re u theing that at the least. shock the fabric breaks mnl a break at; any point or points quickly spreads throughout the extent of the tire.

Lil

The construction herein proposed cm bodies bolsters or cushions which extend peripherally of the tire and are arranged at the convex part of the tread, their purpose being to tension the backing or lining pro riou's to iullutiou and to prevent the tension from being int-reused to u, nmtorinl extent consul ueut to inflation.

lhu unlinn-ul's of the invention are illus- [ruled in the accompanying drawings,,

win-rein Figure l is u rroau section of the preferred form. illlti Fig. 3 is a cross section of u slighlly Inmliliml i'orm.

Referring to l ig. l the tire cover includes proh-ruhly uli iuhgrnul lining or hacking unulu of four luyeus pl suitable material, r. canvas} a. I, :1 null 'lhe luyi-ru u, I; :lro wpurulml from llu: Jurors I, n by the l'ull-'ll'l' r- \rhi -h l'.\'li'l.l(lS u-riplwrully of the wow and is urruugtl longitudinally ventral o! th lullvr, ilnsuiil lmluti-r having u lloul'h' mum-x llhHH' Ftllllllll. 'llw murals l:| 'rs .ulun-suiil urn im-lm-i-il lny ulrmul ur -m'nl r/ preferably of rulihur lnlnvvn who-h uml Llw inh-ruul hut-hing or liniu; lmLh-m I' anarranged. 'l'lmlmlslors f urn gi-m-mlli' similar to llu: lmlslor (I uml uro (llhljllhlfll ul, vault Slllt, oi the lullur, lln'ir pur- 1mm) living to count with the lmluler 1: HI

putting an initial tension on the canvas hut-king or lining uutl to cause the latter to have an irregularly curved cross sot-lion. The other elmueuts: of the cover one a trend rum-as Ia. whirl! int-loses the ruhher trend tl'tw't'lll 5 and an outer tread i which is ulso prelernhly of rubber. Fig. 1 illustrates the condition of the cover and the relation of its parts prior to fitting the some upon the rim. Mounting that the cover has been fitted [\Iltl that the inner tube is being in- Huh-ti, the pressure :u-ts on the lining to proiluee an int-roused tensioning thereof with (he l'l'hllll that there is unu'oly :1 slight- (llllllllllilllll of the convexity of the holsters utul fl'hrse holsters nerertlwless retain their geueml shape :nul tho eunrus layers. while still ltlzlilll'tllllfll unilor nupllirieul tension, are by no means lenuionoil to u degree which upprnurln's llw breaking point. in the event. of a shook to the tiro. the only result is'thut there will he a. still further lllllll- Million of the convexity of the lmlslors ulnl a corresponding increase of ihe tension of the canvas lu reru, whioh il'nsimi uewrllwloss will lllHlll all conditions prm-lieully encountered he unileriully loss than the lu'eult iug tension and the irregularity of the lllll'l'l'tl ([1155 section of the luyens will still he muiutuiiwil. V

The runsllucliou shown in l 'ig. .5 \lill'era in no way in its ihQLlllltll prilu'iplrs From the construction shown in Fig. l, the lltpi'll'llll't concerning (he (lUltlllS of organizati n. in this case-the holsters f are not employed and the holster 0 instead of living lllli-l|)fl.-'ml he iii'eeutho cuuvus layers (1, i" :nul 1/. 1:. is muheihh-ll in- :1 central internally l'llllltll or ll'lllflfllltttl portion of tho lrvznl ('rvFut'ul g so us to produce it cox-rm nunlin; th-fntiuuliun of [he cross section oi the rum'uu hut-hingor lining. in this eonslruvl-iou llnholull-r 1 iuslmnl of hurling u tlouhlo ('nnwx. has cirrulzu' (Toss sot-lion :uul unllslfils pri-l'i-ruhly of :t twisted mttun rahle having ts mils jfilllfll in u suitulile unmm'r.

-'l:hc ell'rul ohluilu-il liy lhu \:Hll.-'ll\ll'llllll shown in Fig. 2 is similar in llH. olh-i-l. uhluiluul |1 lho chostruvlion shown lil Fig. l. The (h-lnrniuiion of llW runvus lint-hing or lining is originally ul Lil 'il (Ml-ill that it i-nulihis Hillll inn-kin or lining ln have u l'ullliuuous irregular curve mulrr nll ll('; lll ol as applied to certain of the parts in the following claims is to be given a strict constructlon.

Having fully described my claim:

1. A pneumatic tire comprising an outer covering having a crescent-shaped tread portion, an internal backing formed of a number of superposed fabric layers arranged to lie against the inner face of the cover but not embedded therein,- and a circumfercntially disposed bolster of substan tial thickness and of separate material from the tire, the bolster being arranged symmetrically at the thickened part of the tread of the cover and adjacent the inner face thereof, the bolster being formed and proportioned to provide an annular convex rib which bears against said backing and acts thereon to produce an ori inal tensioning thereof and causes said baciing to have an irregular and s mmetrically curved. cross section, as and or the purpose set forth.

2. A pneumatic tire comprising an outer cover having a crescent-shaped tread portion, an internal backing formed of a numher of superposed fabric layers and peripherally extending bolsters arranged symmetrically with respect to one another, said invention, I

1,oas,cao

bolsters placing the backing in tension before inflation and at the same time causing the backing to have an original irregularly curved cross section, the central bolster being arranged between the intermediate fabric layers and the other bolsters being arranged between the backing and the ad acent portions of the cover.

3. A pneumatic tire comprising an outer covering having a qrescent shaped tread portion, an internal backing formed ofa number of superposed fabric layers arranged to bear against the inner face of the cover butnot embedded therein, and a. peripherally extending holster arranged symmetri cally with respect to the cover and to the backing and-bearing directly against the latter, said bolster placing the backin in tension and at the same time causing tie backing to have an original, irregularly curved cross-section,

In testimony whereof Ihave hereunto set my hand in presence of two subscribing wit messes.

H. C. Coxs, HENRY Roman. 

